Malicious PDF — malware analysis report

Static analysis result for SHA-256 10af50568f718b13…

MALICIOUS

PDF

95.5 KB Created: 2021-03-16 03:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 485ba2afed7e326623579dd7d04b9caf SHA-1: 8914fb7f6fca43f891f3b1a8a2c081bbbcbd6f91 SHA-256: 10af50568f718b1379a95bf046d7a69d4de43d7f92d42f9de5763f9b9a92795a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with one specifically pointing to 'golowaki.ru' and a query parameter suggesting a lure related to transferring video tapes. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=how+to+transfer+8mm+camcorder+tapes+to+dvd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443821/normal_604102bf6b085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_6026b43116c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_603bee64d8a1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485163/normal_5fffa1106f612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_60207bcee0802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394071/normal_6040049dd44ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ff4db9d5f1fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_6043c24d86ecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_60107895966cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_6004e70984155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_6010d4508508c.pdfIn PDF document text
    • http://mademupo.22web.org/82497089590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5ff40f579a423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c70bb70-fc26-459b-8dc2-39efca69a78b/what_is_the_purpose_of_a_nursing_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999378cb-b9c9-4e3f-8d26-f1ec4201a67f/why_does_my_washing_machine_have_no_power.pdfIn PDF document text
    • http://zaxigadanu.rf.gd/before_i_go_to_sleep_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a77c78-b4a7-4a05-afab-80458c2b528d/curse_of_strahd_ireena_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce94d14-02ea-448e-a94c-bcbe9e1238a0/arris_modem_cm820a_manual.pdfIn PDF document text
    • http://pemukusa.epizy.com/adani_green_energy_annual_report.pdfIn PDF document text
    • http://nodobaviravi.epizy.com/repairman_for_maytag_washer.pdfIn PDF document text
    • http://lobosubutuke.epizy.com/ingersoll_rand_air_compressor_repair_service.pdfIn PDF document text
    • http://xuxedawijepi.rf.gd/xuxerakifiperokuram.pdfIn PDF document text
    • http://bununosaj.epizy.com/semorelopurere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c9d333-2243-41c1-a7ea-76abb478170b/gegaboxofedobor.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/graduation_vitamin_c_piano_sheet_music.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 5576 bytes
SHA-256: 5636e0d76437e630bfc7611c27c46426bb7cbe2f11a683a5b64f60fa51406afc
font_01_sfnt_off00014761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 12160 bytes
SHA-256: c38cdacbf234f3c925445b7afddc1e8382b88c688b536e1f828608823940eff3